<template>
  <div class="component-upload-image">
    <el-upload ref="imageUpload" :action="uploadImgUrl" :before-upload="handleBeforeUpload" :class="{ hide: this.fileList.length >= this.limit }"
               :file-list="fileList" :headers="headers" :limit="limit" :multiple="multiple"
               :on-error="handleUploadError" :on-exceed="handleExceed" :on-preview="handlePictureCardPreview" :on-remove="handleDelete"
               :on-success="handleUploadSuccess" :show-file-list="true"
               list-type="picture-card">
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div v-if="showTip" slot="tip" class="el-upload__tip">
      {{ $t('components.FileUpload.index.232435-1') }}
      <template v-if="fileSize">
        {{ $t('components.FileUpload.index.232435-2') }}
        <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        {{ $t('components.FileUpload.index.232435-3') }}
        <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
      </template>
      {{ $t('components.FileUpload.index.232435-4') }}
    </div>

    <el-dialog :title="$t('components.ImageUpload.384733-0')" :visible.sync="dialogVisible" append-to-body
               width="800">
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto"/>
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth';

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg'],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    // 是否支持多选文件
    multiple: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: '',
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + '/common/upload', // 上传的图片服务器地址
      headers: {
        Authorization: 'Bearer ' + getToken(),
      },
      fileList: [],
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === 'string') {
              if (item.indexOf(this.baseUrl) === -1) {
                item = {name: this.baseUrl + item, url: this.baseUrl + item};
              } else {
                item = {name: item, url: item};
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = '';
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf('image') > -1;
      }

      if (!isImg) {
        this.$modal.msgError(this.$t('components.FileUpload.index.232435-6') + `${this.fileType.join('/')}` + this.$t('components.FileUpload.index.232435-7'));
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(this.$t('components.ImageUpload.384733-1') + `${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading(this.$t('components.ImageUpload.384733-2'));
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(this.$t('components.ImageUpload.384733-3') + `${this.limit}` + this.$t('components.ImageUpload.384733-4'));
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({name: res.fileName, url: res.fileName});
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除图片
    handleDelete(file) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit('input', this.listToString(this.fileList));
      }
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError(this.$t('components.ImageUpload.384733-5'));
      this.$modal.closeLoading();
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit('input', this.listToString(this.fileList));
        this.$modal.closeLoading();
      }
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = '';
      separator = separator || ',';
      for (let i in list) {
        if (list[i].url) {
          strs += list[i].url.replace(this.baseUrl, '') + separator;
        }
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
